GM Service Manual Online
For 1990-2009 cars only

Ignition Control Module Replacement Procedure

Removal Procedure


    Object Number: 28342  Size: SH
  1. Remove all the electrical connectors at the ignition control module.
  2. Note position of spark plug wires for installation.
  3. Remove the spark plug wires from ignition coils.
  4. Remove the screws securing coil assemblies to ignition control module.
  5. Disconnect coils from ignition control module.
  6. Remove the fasteners securing ignition control module assembly to engine.
  7. Remove the ignition control module.

Installation Procedure


    Object Number: 28342  Size: SH
  1. Install the coils to ignition control module.
  2. Install the screws.
  3. Tighten
    Tighten the screws to 4-5 N·m (40 lb in).

    Refer to

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

    in General Information.

  4. Install the fasteners securing assembly to engine.
  5. Tighten
    Tighten the fasteners to 8 N·m  (70 lb in).

  6. Install the spark plug wires as noted during removal.
  7. Install the electrical connectors to the ignition control module.

Ignition Control Module Replacement Ignition Coil

Removal Procedure


    Object Number: 15977  Size: SH
  1. Remove the spark plug wires.
  2. Remove the 2 screws securing ignition coil to ignition control module.
  3. Remove the ignition coil.

Installation Procedure


    Object Number: 15977  Size: SH
  1. Install the ignition coil.
  2. Install the 2 screws.
  3. Tighten
    Tighten the screws to 4-5 N·m (40 lb in).

    Refer to

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

    in General Information.

  4. Install the spark plug wires.